Environment-friendly plastic packaging material and preparation method thereof

Abstract

The invention provides an environment-friendly plastic packaging material and a preparation method thereof, which are applied to the technical field of plastic packaging, and are prepared by the following steps: crushing a biomass raw material into particles of 0.5-5cm, and removing impurities at a high temperature of 110 DEG C for 15 minutes; drying PLA / PHA particles, dissolving the PLA / PHA particles in a solvent, and stirring at 60 DEG C until the PLA / PHA particles are homogenized; adding a functional additive, controlling the temperature to 170-180 DEG C, and carrying out melt blending; carrying out extrusion blow molding on the solution through an annular die head, and cooling and shaping to obtain a film; aiming at the reasons that current plastics are difficult to degrade and the cost of preparation materials is long, starch and bamboo fibers which are common in the market, low in cost and easy to degrade are used as raw materials for processing, PLA / PHA molecular chains are decomposed through microbial secretase through the steps of mixing, dispersing, heating modification and the like, CO2 / H2O is generated, surface erosion is accelerated through ultraviolet photosensitivity of the bamboo fibers, and the surface corrosion resistance is improved. The microbial invasion is promoted, the dependence on petrochemical resources is reduced, the brown rot fungus fermented biomass and the mycelium network natural bonding filler are introduced, an adhesive is replaced, the strength is improved by 20%, and composting can be achieved by 100%.

Description

Technical Field

[0001] The present application relates to the field of plastic packaging technology, and in particular to an environmentally friendly plastic packaging material and a preparation method thereof. Background Art

[0002] Plastic packaging materials are mainly made of synthetic or natural polymer resins. After adding various additives, the prepared packaging materials have excellent performance, wide applications, and low processing costs. my country's plastic packaging industry can produce more than 30 varieties of plastic packaging materials in six categories. In the plastic packaging industry, my country's domestic situation is not optimistic. There is a lack of large enterprises. The scale of enterprises in the entire industry is small and scattered. It also faces market intrusion from many foreign brands. For example, the German Schott Group has entered the Chinese market in a big way with its strong technical and economic strength.

[0003] Plastic refers to a material that is primarily composed of resin and contains additives, allowing it to flow and form during processing. Plastic does not contain fibers, coatings, or binders. Plastic materials are typically composed of two basic materials: one is the base material—resin, and the other is the auxiliary material—additives. The composition of the materials and the ratio of the components have a certain impact on the performance of plastic products.

[0004] The production of plastics can easily cause environmental pollution and is difficult to degrade. Traditional plastic bags are mainly made of petroleum-based plastics such as polyethylene and polypropylene. They have a stable molecular structure and take more than 200 years to decompose in the natural environment. A large number of discarded plastic bags accumulate in the soil, destroying soil permeability and fertility, and affecting crop growth. Therefore, how to make plastic packaging made of environmentally friendly materials is a problem that needs to be solved at present. Summary of the Invention

[0005] This application aims to solve the problem that the production of plastics easily pollutes the environment and is difficult to degrade. Traditional plastic bags are mainly made of petroleum-based plastics such as polyethylene and polypropylene. They have stable molecular structures and take more than 200 years to decompose in the natural environment. A large number of discarded plastic bags accumulate in the soil, destroying the soil's permeability and fertility, and affecting the growth of crops. Therefore, how to make plastic packaging with environmentally friendly materials is a technical problem that needs to be solved at present. Provided are an environmentally friendly plastic packaging material and a preparation method thereof.

[0006] This application uses the following technical means to solve the technical problem:

[0007] An environmentally friendly plastic packaging material and a preparation method thereof, wherein the environmentally friendly plastic packaging material is made of the following raw materials in parts by weight:

[0008] The polylactic acid fraction is 25-35 parts;

[0009] 25-35 parts of polyhydroxyalkanoate;

[0010] 10-20 parts of enhancer;

[0011] 5-20 parts of functional additives.

[0012] Furthermore, the enhancer includes but is not limited to 10-20 parts of starch and 10-20 parts of cellulose.

[0013] Furthermore, the functional additive is:

[0014] Plasticizers, stabilizers, antimicrobial agents, nano-reinforcements and coupling agents.

[0015] Furthermore, the preparation method comprises the following steps:

[0016] S1. Grind the biomass raw material into 0.5-5 cm particles and heat at 110 degrees Celsius for 15 minutes to remove impurities;

[0017] S2. Dry the PLA / PHA particles, dissolve them in a solvent at 60 degrees Celsius and stir until homogeneous;

[0018] S3, adding functional additives and controlling the temperature to 170-180 degrees Celsius for melt blending;

[0019] S4, the melt is extruded through an annular die and blown, and cooled and shaped into a film;

[0020] S5. The mold temperature is 40-50 degrees Celsius, and the holding time is 30 seconds to obtain the package.

[0021] Furthermore, in the step of drying the PLA / PHA particles and then dissolving them in a solvent and stirring them at 60 degrees Celsius until homogeneous,

[0022] Cellulose nanofibrils are added and dispersed evenly at the nanoscale through ultrasonic dispersion.

[0023] Furthermore, in the step of adding cellulose nanofibrils and uniformly dispersing them at the nanoscale by ultrasonic dispersion,

[0024] The ultrasonic dispersion power was 300W and the time was 20 min.

[0025] Furthermore, in the step of adding functional additives and controlling the temperature at 170-180 degrees Celsius for melt blending,

[0026] The functional additives are chitosan, plasticizer and stabilizer, and a twin-screw extruder is used with a shear rate controlled at 100-200 rpm.

[0027] This application provides an environmentally friendly plastic packaging material and a preparation method thereof, which has the following beneficial effects:

[0028] In order to address the current difficulties in degrading plastics and the high cost of preparing materials, the raw materials are processed from common, low-cost and easily degradable starch and bamboo fiber on the market. Through mixing, dispersion, heat modification and other steps, microorganisms secrete enzymes to decompose PLA / PHA molecular chains to generate CO2 / H2O. The ultraviolet sensitivity of bamboo fiber accelerates surface erosion, promotes microbial invasion, and reduces dependence on petrochemical resources. In addition, brown rot fungi are introduced to ferment biomass, and the mycelium network is a natural bonding filler to replace adhesives, increasing strength by 20% and making it 100% compostable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of an embodiment of the environmentally friendly plastic packaging material and the preparation method thereof of the present application.

[0030] The implementation, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] It should be noted that the terms "include", "comprising" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices. In the claims, specification and drawings of this application, relational terms such as "first" and "second" are merely used to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any actual relationship or order between these entities / operations / objects.

[0034] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] Reference Attachment Figure 1 , is a flow chart of an environmentally friendly plastic packaging material and a preparation method thereof in one embodiment of the present application;

[0036] Example 1

[0037] An environmentally friendly plastic packaging material and a preparation method thereof, wherein the environmentally friendly plastic packaging material is made of the following raw materials in parts by weight:

[0038] The polylactic acid fraction is 25-35 parts;

[0039] 25-35 parts of polyhydroxyalkanoate;

[0040] 10-20 parts of enhancer;

[0041] 5-20 parts of functional additives.

[0042] In this embodiment, the enhancer includes but is not limited to 10-20 parts of starch and 10-20 parts of cellulose.

[0043] Specifically,

[0044] The content of polylactic acid is 25 parts, polyhydroxyalkanoate is 25 parts, cellulose is 10 parts, and functional additives is 5 parts;

[0045] The functional additive is:

[0046] Plasticizers, stabilizers, antimicrobial agents, nano-reinforcements and coupling agents.

[0047] The preparation method comprises the following steps:

[0048] S1. Grind the biomass raw material into 0.5-5 cm particles and heat at 110 degrees Celsius for 15 minutes to remove impurities;

[0049] S2. Dry the PLA / PHA particles, dissolve them in a solvent at 60 degrees Celsius and stir until homogeneous;

[0050] S3, adding functional additives and controlling the temperature to 170-180 degrees Celsius for melt blending;

[0051] S4, the melt is extruded through an annular die and blown, and cooled and shaped into a film;

[0052] S5. The mold temperature is 40-50 degrees Celsius, and the holding time is 30 seconds to obtain the package.

[0053] In the step of drying the PLA / PHA particles and then dissolving them in a solvent and stirring them at 60 degrees Celsius until they are homogeneous,

[0054] Cellulose nanofibrils are added and dispersed evenly at the nanoscale through ultrasonic dispersion.

[0055] In the step of adding cellulose nanofibrils and dispersing them uniformly at the nanoscale by ultrasonic dispersion,

[0056] The ultrasonic dispersion power was 300W and the time was 20 min.

[0057] In the step of adding functional additives and controlling the temperature at 170-180 degrees Celsius for melt blending,

[0058] The functional additives are chitosan, plasticizer and stabilizer, and a twin-screw extruder is used with a shear rate controlled at 100-200 rpm.

[0059] Specifically, the biomass raw materials were crushed into 0.5-5cm particles, sterilized at 110℃ for 15 minutes to inactivate microorganisms and remove impurities. Then, the PLA / PHA particles were dried to a moisture content of ≤0.1% to prevent melt hydrolysis. The PLA / PHA was then dissolved in a solvent by drying, stirred and homogenized at 60℃, and cellulose nanofibrils were added. Ultrasonic dispersion at 300W for 20 minutes was performed to make the nanofibril particle size ≤100nm without agglomeration, forming a three-dimensional network structure to improve the film tensile strength to ≥25MPa and reduce The oxygen permeability is 40%. Then, chitosan, citrate, stabilizer and other additives are added, and the temperature is controlled at 170-180℃ for melt blending using a twin-screw extruder to optimize the phase interface bonding to avoid chitosan inactivation, ensure that the antibacterial rate is ≥99%, and the plasticizer improves fluidity and reduces energy consumption by 35%. Finally, the melt is extruded and blown through an annular die to form a 0.05-0.1mm film, or injection molded to produce box / bottle packaging, so as to achieve the goal of using biomass raw materials to achieve easy degradation without reducing the quality of plastics and low cost.

[0060] Example 2

[0061] An environmentally friendly plastic packaging material and a preparation method thereof, wherein the environmentally friendly plastic packaging material is made of the following raw materials in parts by weight:

[0062] The polylactic acid fraction is 25-35 parts;

[0063] 25-35 parts of polyhydroxyalkanoate;

[0064] 10-20 parts of enhancer;

[0065] 5-20 parts of functional additives.

[0066] The enhancer includes but is not limited to 10-20 parts of starch and 10-20 parts of cellulose.

[0067] The functional additive is:

[0068] Plasticizers, stabilizers, antimicrobial agents, nano-reinforcements and coupling agents.

[0069] The preparation method comprises the following steps:

[0070] S1. Grind the biomass raw material into 0.5-5 cm particles and heat at 110 degrees Celsius for 15 minutes to remove impurities;

[0071] S2. Dry the PLA / PHA particles, dissolve them in a solvent at 60 degrees Celsius and stir until homogeneous;

[0072] S3, adding functional additives and controlling the temperature to 170-180 degrees Celsius for melt blending;

[0073] S4, the melt is extruded through an annular die and blown, and cooled and shaped into a film;

[0074] S5. The mold temperature is 40-50 degrees Celsius, and the holding time is 30 seconds to obtain the package.

[0075] In the step of drying the PLA / PHA particles and then dissolving them in a solvent and stirring them at 60 degrees Celsius until they are homogeneous,

[0076] Cellulose nanofibrils are added and dispersed evenly at the nanoscale through ultrasonic dispersion.

[0077] In the step of adding cellulose nanofibrils and dispersing them uniformly at the nanoscale by ultrasonic dispersion,

[0078] The ultrasonic dispersion power was 300W and the time was 20 min.

[0079] In the step of adding functional additives and controlling the temperature at 170-180 degrees Celsius for melt blending,

[0080] The functional additives are chitosan, plasticizer and stabilizer, and a twin-screw extruder is used with a shear rate controlled at 100-200 rpm.

[0081] Specifically,

[0082] From biomass sterilization and drying → nanofiber ultrasonic dispersion → low-temperature melt blending → precision blow molding / injection molding, through the three key technologies of PLA / PHA compound ratio optimization, 300W / 20min ultrasonic dispersion and twin-screw shear temperature control, the functional integration of high strength and toughness, fast degradation and strong barrier is simultaneously achieved, providing a green alternative for food and cosmetics packaging.

[0083] Example 3

[0084] An environmentally friendly plastic packaging material and a preparation method thereof, wherein the environmentally friendly plastic packaging material is made of the following raw materials in parts by weight:

[0085] The polylactic acid fraction is 25-35 parts;

[0086] 25-35 parts of polyhydroxyalkanoate;

[0087] 10-20 parts of enhancer;

[0088] 5-20 parts of functional additives.

[0089] The enhancer includes but is not limited to 10-20 parts of starch and 10-20 parts of cellulose.

[0090] The functional additive is:

[0091] Plasticizers, stabilizers, antimicrobial agents, nano-reinforcements and coupling agents.

[0092] The preparation method comprises the following steps:

[0093] S1. Grind the biomass raw material into 0.5-5 cm particles and heat at 110 degrees Celsius for 15 minutes to remove impurities;

[0094] S2. Dry the PLA / PHA particles, dissolve them in a solvent at 60 degrees Celsius and stir until homogeneous;

[0095] S3, adding functional additives and controlling the temperature to 170-180 degrees Celsius for melt blending;

[0096] S4, the melt is extruded through an annular die and blown, and cooled and shaped into a film;

[0097] S5. The mold temperature is 40-50 degrees Celsius, and the holding time is 30 seconds to obtain the package.

[0098] In the step of drying the PLA / PHA particles and then dissolving them in a solvent and stirring them at 60 degrees Celsius until they are homogeneous,

[0099] Cellulose nanofibrils are added and dispersed evenly at the nanoscale through ultrasonic dispersion.

[0100] In the step of adding cellulose nanofibrils and dispersing them uniformly at the nanoscale by ultrasonic dispersion,

[0101] The ultrasonic dispersion power was 300W and the time was 20 min.

[0102] In the step of adding functional additives and controlling the temperature at 170-180 degrees Celsius for melt blending,

[0103] The functional additives are chitosan, plasticizer and stabilizer, and a twin-screw extruder is used with a shear rate controlled at 100-200 rpm.

[0104] Specifically,

[0105] In order to address the current difficulties in degrading plastics and the high cost of preparing materials, the raw materials are processed from common, low-cost and easily degradable starch and bamboo fiber on the market. Through mixing, dispersion, heat modification and other steps, microorganisms secrete enzymes to decompose PLA / PHA molecular chains to generate CO2 / H2O. The ultraviolet sensitivity of bamboo fiber accelerates surface erosion, promotes microbial invasion, and reduces dependence on petrochemical resources. In addition, brown rot fungi are introduced to ferment biomass, and the mycelium network is a natural bonding filler to replace adhesives, increasing strength by 20% and making it 100% compostable.

[0106] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0108] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0110] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly plastic packaging material and a preparation method thereof, characterized in that: The environmentally friendly plastic packaging material is made of the following raw materials in parts by weight: The polylactic acid fraction is 25-35 parts; 25-35 parts of polyhydroxyalkanoate; 10-20 parts of enhancer; 5-20 parts of functional additives.

2. The environmentally friendly plastic packaging material and preparation method thereof according to claim 1, characterized in that: The enhancer includes but is not limited to 10-20 parts of starch and 10-20 parts of cellulose.

3. The environmentally friendly plastic packaging material and preparation method thereof according to claim 1, characterized in that: The functional additive is: Plasticizers, stabilizers, antimicrobial agents, nano-reinforcements and coupling agents.

4. The environmentally friendly plastic packaging material and preparation method thereof according to claim 1, characterized in that: The preparation method comprises the following steps: S1. Grind the biomass raw material into 0.5-5 cm particles and heat at 110 degrees Celsius for 15 minutes to remove impurities; S2. Dry the PLA / PHA particles, dissolve them in a solvent at 60 degrees Celsius and stir until homogeneous; S3, adding functional additives and controlling the temperature to 170-180 degrees Celsius for melt blending; S4, the melt is extruded through an annular die and blown, and cooled and shaped into a film; S5. The mold temperature is 40-50 degrees Celsius, and the holding time is 30 seconds to obtain the package.

5. The environmentally friendly plastic packaging material and preparation method thereof according to claim 4, characterized in that: In the step of drying the PLA / PHA particles and then dissolving them in a solvent and stirring them at 60 degrees Celsius until they are homogeneous, Cellulose nanofibrils are added and dispersed evenly at the nanoscale through ultrasonic dispersion.

6. The environmentally friendly plastic packaging material and preparation method thereof according to claim 5, characterized in that: In the step of adding cellulose nanofibrils and dispersing them uniformly at the nanoscale by ultrasonic dispersion, The ultrasonic dispersion power was 300W and the time was 20 min.

7. The environmentally friendly plastic packaging material and preparation method thereof according to claim 4, characterized in that: In the step of adding functional additives and controlling the temperature at 170-180 degrees Celsius for melt blending, The functional additives are chitosan, plasticizer and stabilizer, and a twin-screw extruder is used with a shear rate controlled at 100-200 rpm.

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